|Notable family members|
Umbridge family (claimed)
Dolores Umbridge claimed to be related to the Selwyns in 1997, lying about how she obtained Salazar Slytherin's Locket. Umbridge took it as a bribe from Mundungus Fletcher, but told Hermione Granger, who was disguised as Mafalda Hopkirk through use of Polyjuice Potion, that it was an old family heirloom. She was likely lying to "bolster her own pure-blood credentials"; however, it is unclear whether Umbridge was lying about her relation to the Selwyns or simply her own blood status.